Pagination dict() support

[nicolashahn]

For issue #482

Credit goes to @protream, I just implemented

Now you can do this:

>>> p = Pagination('a',1,20,100,[])
>>> dict(p)
{'page': 1, 'pages': 5, 'total': 100, 'has_prev': False, 'next_num': 2, 'has_next': True, 'items': []}
>>> p['page']
1

[rsyring]

Is this a dup of #485?

[davidism]

While this is clever, Pagination is not actually dict-like, so making dict(Pagination) work is a little too magical for me.